Differential Equations

Advanced calculus topics from Diff EQ go here.
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what is the salt content in tank B at precise moment tank B contains 250 gal of soln?
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Deleted member 4993
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determine the differential equation which models this circuit; plot the graph of char
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Deleted member 4993
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show that the charge reaches a maximum in aging battery generating 200 e-5t volts
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Deleted member 4993
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M
What is the lag time between max inside, outside temperatures of house?
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Deleted member 4993
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lake with volume V=100 km^3 is fed by a river at a rate of r km^3 /yr. In addition...
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Deleted member 4993
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M
first order eqns: u' + 2tu = e^(-t2), u = u(t); cos(x)u' + u = 3, u(x/2) = 1, u = u(x
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Deleted member 4993
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S
Find determinant of matrix of second partials (regularities of product life cycle)
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stapel
stapel
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How to approach this diff-EQ? (x^3+ xy^2 + y)dx - xdy = 0
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stapel
stapel
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Eliminate A and B to obtain the differential equation: y=Asin2x+Bcos3x
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Deleted member 4993
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R
few numerical methods question ... ?
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rosekidcute
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Given y'' = y^2, where y'' = (d^2y / dx^2) then, integrate once, get y' = y^3 / 3 ...
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Deleted member 4993
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Stuck at finding the second partial derivative
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EgzonKorenica
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Finding the extrema of functions.
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stapel
stapel
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Factoring y'''' + 0.45 y''' -0.165y"+ 0.0045y' -0.00175y =0
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Deleted member 4993
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need help if this equation follows math rules: XA・dμA+XB・dμB=0
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Ishuda
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Diff. sys. w/ init. val. prob 2nd ord: y"_1=-10y_1+6y_2, y"_2=6y_1-10y_2
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stapel
stapel
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how to solve this equation? x+y-a/x+y-b (dy/dx)=x+y+a/x+y+b
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Deleted member 4993
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D
weight rolling down board; logistic eqn; thermometer; eliminating arb. constants; etc
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Deleted member 4993
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How do you separate the variables in this equation dy/dx= y/x + x/y ?
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yousuf402
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few basic questions about differential equations ??
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rosekidcute
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